Mireault was born in Marville, France, where both parents were stationed while working for the Canadian Forces. In 1963, the Mireault family moved back to Canada. Raised as anAnglophone in Rawdon, Quebec, he has been an active participant in the Montreal underground comix scene, participating in the comix jams since their early inception and contributing to local zines and underground publications. At the same time he has worked in the mainstream comics industry as an artist and colourist, as well as an animator and illustrator.